Black trisazo dye and process of making same.



UNITED STATES PATENT OFFICE.

KARL ELBEL AND IGNAZ ROSENBERG, OF BIEBRICI'I, GERMANY, ASSIGNORS TO KALLE AND COMPANY, OF SAME PLACE.

BLACK TRISAZO DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 671,543, dated April 9, 1901.

Application filed December 1, 1900. Serial No. 38,341. (Specimens.)

To all whom it may concern: ate. The combination of the metatoluylene:

Beitknown that we, KARL ELBEL, asubject diamin being finished, an excess of soda and 50 of the King of Prussia, Emperorof Germany, an alkaline solution of twenty-five kilos aland IGNAZ ROSENBERG, a subject of the Empha beta naphtylene diamin beta sulfonic 5 peror of Austria-Hungary, doctors of philosoacid are added. After stirring the combinaphy, both residing at Biebrich-on-the-Rhine, tion mass for several hours the new dyestuff Germany,(assignors to KALLEAND COMPANY, is precipitated by addition of salt, filtered, 55

of same place,) have invented certain new pressed, and dried. It represents adark-coland useful Improvements in theManufacture ored powder with a metallic luster. In waof a Black Trisazo Dye, of which the followter and concentrated sulfuric acid it is soluing is a specification. ble with bluish-black color. In alcohol it is Our invention relates to the manufacture insoluble. In its aqueous solutions hydro- 60 of valuable black trisazo dyestuffs having the chloric acid causes a black precipitate. It

eneral formula d *es fast-black shades on unmordanted cot- .l flalphalwfi Unsulfonated meta ton from an alkaline-salt bath.

N=N-C; H -(beta,) SO Na/ diamin of the hen- NOW what we 13,111 1s (beta N N zene series P 1. The process of manufacturing new tris- 65 (al ha )NH N m 1 6 (gag), azo dyestuffs havlng as sodium salt the gen (beta some eral formula in which formula P stands for para phenyl- (alpha )OH Unsulfonated diamin of ene d1am1n and paradiamido diphenylamin. N=N-o H, e a, s o n the benzene series The new process consists in preparing the e 7o 1 (alpha )NH tetrazo compound of the intermediate piod N=N OwH44(beta2)rNH: not obtained by combining one molecule of (beta some para diamin with one molecule of gamma amidonaphthol sulfonic acid in alkaline soluconsisting in rediazotizing the intermediate tion and combining the said tetrazo comproduct from one molecule 0f pa dialrlill 75 pound first with one molecule of an unsuland one molecule of gamma amidonaphthol fonated meta diamin of the benzene seri sulfouic acid and combining the so-obtained and afterward with one molecule of alpha tetrazo compound firstwith one moleculeofan beta naphtylene diamin beta sulfonie acid, unsulfonated meta diamin of the benzene se- In the following we describe the method ries and afterward with one molecule of al- 80 employed in producing the dyestuif derived pha beta naphtylene diamin beta sulfonic from paradiamido diphenylamin. acid.

The tetrazo solution obtained in the usual 2. The process of manufacturing the spemanner from twenty kilos paradiamido dicial new trisazo dyestufi having as sodium phenylamin is rendered alkaline with sosalt the formula 8 diurn carbonate and mixed with an alkaline I h solution of twenty-four kilos gamma amido- E% 3 & /NH2(1) 4o naphthol sulfonic acid. When the formation \(bemd v of the intermediate product is finished, we (alpha )NH, add seven kilos of nitrite to the combination Eg3 gap go liquid and run it into an excess of hydrochloric acid previously diluted with 'ice-waconsisting in rediazotizing the intermediate ter. The diazotation being finished, a soluproduct, obtained by combining one moletion of 12.2 kilos meta toluylene diamin is cule of tetrazodiphenylamin and one moleadded. The liquid is then gradually neutralcule of gamma amidonaphthol sulfonic acid 5 ized by adding a solution of sodium carbonin alkaline solution, and by acting on the soproduced tetrazo compound first with one molecule of metatoluylenediamin and after.- ward with one molecule of alpha beta naphtylene diamin beta sulfonic acid.

3. The new trisazo dyestu Es, obtainable by acting on the rediazotized intermediate products of the general formula,

4:. The special new trisazo dyestufi having as sodium salt the formula alphaQOH representing a dark-colored powder showing metallic luster, easily soluble in water and concentrated sulfuric acid with bluish-black color, insoluble in alcohol, being precipitated from its aqueous solutions as black powder by addition of hydrochloric acid, dyeing a fast black on unmordanted cotton from an alkaline-salt bath.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

KARL ELBEL. IGNAZ ROSENBERG.

Witnesses JEAN GRUND, CARL GRUND. 

